X | ( | 1 100 | X | + | 1 | ) | ( | 1 10 | X | + | 1 | ) | = | 0 |
方程左边 = | X | × | 1 100 | X | ( | 1 10 | X | + | 1 | ) | + | X | × | 1 | ( | 1 10 | X | + | 1 | ) |
= | X | × | 1 100 | X | × | 1 10 | X | + | X | × | 1 100 | X | × | 1 | + | X | × | 1 | ( | 1 10 | X | + | 1 | ) |
= | X | × | 1 1000 | X | X | + | X | × | 1 100 | X | + | X | × | 1 | ( | 1 10 | X | + | 1 | ) |
= | X | × | 1 1000 | X | X | + | X | × | 1 100 | X | + | X | × | 1 | × | 1 10 | X | + | X |
= | X | × | 1 1000 | X | X | + | X | × | 1 100 | X | + | X | × | 1 10 | X | + | X | × | 1 |
X | × | 1 1000 | X | X | + | X | × | 1 100 | X | + | X | × | 1 10 | X | + | 1 | X | = | 0 |